DESC:FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules, 2005

COMPLETE SPECIFICATION
(SEE SECTION 10 AND RULE 13)

TITLE OF THE INVENTION

“PRESSURE RELIEF VALVE”

APPLICANTS:

Name Nationality Address
Mahindra & Mahindra Limited Indian Mahindra & Mahindra Ltd.,
MRV, Mahindra World City (MWC),
Plot No. 41/1, Anjur Post, Chengalpattu,
Kanchipuram District – 603004 (TN) INDIA

The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed:-

TECHNICAL FIELD
[001] The embodiments herein relate to safety valves, and more particularly but not exclusively to a relief valve for controlling or limiting the pressure of fluids in a system.

BACKGROUND
[002] Generally, the relief valve is a safety device, which is used to limit the pressure in a system in order to protect life, property and environment. The relief valve is facilitated to open and relieve excess pressure from a system and to reclose and prevent the further release of fluid after normal conditions have been restored. If not resolved properly the excess pressure leads to blocked discharge, exposure to external fire, thermal expansion, chemical reaction, rupture of heat exchanger tube and failure of the cooling system.
[003] The conventional relief valve includes a seat and ball arrangement where the ball is not properly guided. The aforementioned relief valve leads to leakage of the fluid. Moreover, the conventional type relief valves are susceptible to chatter since the built-up back pressure is too high.
[004] Therefore there exists a need for a relief valve that can eliminate the aforementioned drawbacks.

OBJECTS
[005] The principal object of an embodiment of this invention is to provide an improved relief valve that can eliminate leakage of fluid.
[006] Another object of an embodiment of this invention is to provide a chatter free relief valve.
[007] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[008] The embodiments of this invention are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[009] FIG. 1 depicts a perspective view of a relief valve according to an embodiment of the invention as disclosed herein;
[0010] FIG. 2 depicts a cross sectional view of the relief valve according to an embodiment of the invention as disclosed herein;
[0011] FIG. 3 depicts a cross sectional view of a portion of the relief valve showing the plunger in closed position according to an embodiment of the invention as disclosed herein; and
[0012] FIG. 4 depicts a cross sectional view of a portion of the relief valve showing the plunger in open position according to an embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0013] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0014] The embodiments herein achieve a relief valve that can eliminate leakage of fluid. Further, embodiments herein achieve a chatter free relief valve. Referring now to the drawings, and more particularly to FIGS. 1 through 4, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0015] FIG. 1 depicts a perspective view of a relief valve according to an embodiment of the invention as disclosed herein. FIG. 2 depicts a cross sectional view of the relief valve according to an embodiment of the invention as disclosed herein. In an embodiment the relief valve 100 includes a spring 102, a plunger 104, at least one inlet 106, a plunger seat 108, a chamber 110, at least one outlet 112, an adjusting means 114 and a housing 116, a washer 118 and a spacer plug 120.
[0016] In an embodiment, the spring 102 includes a first end 102a and a second end 102b. In an embodiment the first end 102a of the spring 102 is operatively connected with the adjusting means 114 through the spacer plug 120. However, it is also within the scope of the invention to connect the first end 102a of the spring 102 with the adjusting means 114 without the spacer plug 120. The second end 102b of the spring 102 is operatively connected with the plunger 104 through the washer 118. The spring 102 is used for loading the plunger 104 thereby, holding the plunger 104 in a closed position.
[0017] FIG. 3 depicts a cross sectional view of a portion of the relief valve showing the plunger in closed position according to an embodiment of the invention as disclosed herein. FIG. 5 depicts a cross sectional view of a portion of the relief valve showing the plunger in open position according to an embodiment of the invention as disclosed herein. In an embodiment the plunger 104 includes a first end 104a, a second end 104b and a seating portion 104c. In an embodiment the seating portion 104c of the plunger 104 is used for connecting the second end 102b of the spring 102 with the plunger 104 through the washer 118 and is adapted to rest in the plunger seat 108. However, it is also within the scope of the invention to connect the second end 102b of the spring 102 with the plunger 104 without the washer 118. Further, it is also within the scope of the invention to connect the second end 102b of the spring 102 with the first end 104a of the plunger 104. The second end 104b of the plunger 104 is received by the chamber 110. The plunger 104 is used for controlling flow of the fluid (not shown) from the inlet 106 to the outlet 112 of the relief valve 100.
[0018] The plunger 104 is adapted to move between a closed position and an open position. The plunger 104 is said to be in closed position when the seating portion 104c rests in the plunger seat 108 for preventing the flow of fluid from the inlet 106 to the outlet 112 and the plunger 104 is said to be in open position when the seating portion 104c unseats from the plunger seat 108 for facilitating the flow of fluid from the inlet 106 to the outlet 112. The seating portion 104c is used to prevent the flow of fluid from the inlet 106 to the outlet 112 when the plunger 104 is in closed position. The second end 104b of the plunger 104 is received by the chamber 110 for guiding the plunger 104. A clearance/gap (not shown) is defined between the second end 104b and the housing 116 to receive fluid into the chamber 110. The clearance causes flow restriction of fluid into the chamber 110 thereby damping the plunger 104.
[0019] In an embodiment the inlet 106 is used for receiving the fluid (not shown) into the housing 116 of the relief valve 100.
[0020] In an embodiment the plunger seat 108 is used for receiving the seating portion 104c of the plunger 104. The seating portion 104c of the plunger 104 rests in the plunger seat 108 through the spring 102 to prevent the flow of fluid from the inlet 106 to the outlet 112 when the plunger 104 is in closed position.
[0021] In an embodiment the chamber 110 is used for receiving the second end 104b of the plunger 104 and the fluid. The chamber 110 receives the second end 104b for guiding the plunger 104 and the chamber 110 receives the fluid for damping the plunger 104. The guiding of the plunger 104 ensures the seating portion 104c of the plunger 104 rests in the plunger seat 108 properly and therefore prevents any leakage of fluid flowing from inlet 106 to the outlet 112 when the plunger 104 is in closed position. By damping the plunger 104 the relief valve 100 becomes chatter free.
[0022] In an embodiment the outlet 112 is used for venting the fluid from the housing 116 of the relief valve 100.
[0023] In an embodiment the adjusting means 114 is used for adjusting the predetermined load provided by the spring 102.
[0024] In an embodiment the housing 116 is used for receiving the spring 102, plunger 104 and the adjusting means114.
[0025] The working of the relief valve 100 is as follows. As the fluid enters the inlet 106, the fluid passes from the inlet 106 to the chamber 110 through the clearance/gap between the second end 104b of the plunger 104 and the housing 116. The clearance causes a restriction to fluid flow, thereby creating the damping effect and makes the relief valve 100 chatter free. Further, normally the plunger 104 is in closed position and when the pressure of the fluid exceeds the predetermined load provided by the spring 102 of the relief valve 100, the fluid pressure overcomes the load/force of the spring 102, thereby the fluid pushes the plunger 104 against the force of the spring 102 and unseats the seating portion 104c of the plunger 104 from the plunger seat 108 i.e the plunger 104 is moved to open position from the closed position and the fluid from the inlet 106 flows to the outlet 112 and exits through the outlet 112. Once the pressure of the fluid becomes less than the predetermined load provided by the spring 102, the spring 102 moves the plunger 104 to rest the seating portion 104c of the plunger 104 in the plunger seat 108 i.e the plunger is moved to closed position from the open position and the flow of fluid from the inlet 106 to the outlet 112 is prevented.
[0026] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

CLAIMS
We claim,
1. A relief valve comprising:
at least one inlet adapted for receiving a fluid;
at least one outlet adapted for venting the fluid;
a plunger adapted to move between a closed position and an open position for controlling the flow of fluid from the inlet to the outlet, the plunger having a first end, a second end and a seating portion;
a plunger seat adapted for receiving the seating portion of the plunger;
a spring adapted for loading the plunger;
a chamber adapted for receiving the second end of the plunger for guiding the plunger and for receiving the fluid for damping the plunger; and
a housing adapted for receiving the spring and the plunger,
wherein
the seating portion of the plunger rests in the plunger seat during the closed position for preventing the flow of fluid from the inlet to the outlet; and the seating portion of the plunger unseats from the plunger seat during the open position for facilitating the flow of fluid from the inlet to the outlet; and the chamber is adapted to receive the fluid through a clearance provided between the second end of the plunger and the housing for damping the plunger.
2. The relief valve as claimed in claim 1, further comprising an adjusting means adapted for adjusting a predetermined load of the spring.
3. The relief valve as claimed in claim 1, wherein the seating portion of the plunger unseats from the plunger seat if a pressure of the fluid is greater than the predetermined load of the spring.
4. The relief valve as claimed in claim 1, wherein the seating portion of the plunger rests in the plunger seat if the pressure of the fluid is lesser than the predetermined load of the spring.

Date: February 24th, 2016 Signature:
Dr..Kalyan Chakravarthy

ABSTRACT
Pressure relief valve includes at least an inlet, an outlet, a plunger, a plunger seat, a spring, a chamber and a housing. The plunger is used for controlling the flow of fluid from the inlet to the outlet and the plunger includes a first end, a second end and a seating portion. The seating portion of the plunger rests in the plunger seat for preventing the flow of fluid from the inlet to the outlet and the seating portion of the plunger unseats from the plunger seat for facilitating the flow of fluid from the inlet to the outlet and the chamber is receives the fluid through a clearance provided between the second end of the plunger and the housing for damping the plunger.
,CLAIMS: CLAIMS
We claim,
1. A relief valve comprising:
at least one inlet adapted for receiving a fluid;
at least one outlet adapted for venting the fluid;
a plunger adapted to move between a closed position and an open position for controlling the flow of fluid from the inlet to the outlet, the plunger having a first end, a second end and a seating portion;
a plunger seat adapted for receiving the seating portion of the plunger;
a spring adapted for loading the plunger;
a chamber adapted for receiving the second end of the plunger for guiding the plunger and for receiving the fluid for damping the plunger; and
a housing adapted for receiving the spring and the plunger,
wherein
the seating portion of the plunger rests in the plunger seat during the closed position for preventing the flow of fluid from the inlet to the outlet; and the seating portion of the plunger unseats from the plunger seat during the open position for facilitating the flow of fluid from the inlet to the outlet; and the chamber is adapted to receive the fluid through a clearance provided between the second end of the plunger and the housing for damping the plunger.
2. The relief valve as claimed in claim 1, further comprising an adjusting means adapted for adjusting a predetermined load of the spring.
3. The relief valve as claimed in claim 1, wherein the seating portion of the plunger unseats from the plunger seat if a pressure of the fluid is greater than the predetermined load of the spring.
4. The relief valve as claimed in claim 1, wherein the seating portion of the plunger rests in the plunger seat if the pressure of the fluid is lesser than the predetermined load of the spring.